Display Control Unit (DCU)
MPC5606S Microcontroller Reference Manual, Rev. 7
336 Freescale Semiconductor
• Digital video input with and without sync extraction per ITU-R BT.656 supporting multiple video
input formats including RGB666, RGB565, monochrome and YCbCr422
• Dedicated memory blocks to store a cursor and Color Look Up Tables (CLUTs)
Each graphic layer has the following attributes
• Can be placed with one pixel resolution in either axis
• Supports multiple color-encoding formats including 1, 2, 4, and 8 bits per pixel indexed colors,
RGB565 and RGB888 direct colors, and ARGB1555, ARGB4444 and ARGB8888 direct colors
with an alpha channel
• Alpha blending with 8-bit resolution
• Chroma-key blending for anti-mask encoding
• Multiple alpha and chroma-key blending modes
• Transparency modes for anti-aliased text and graphics
• Luminance mode for highlighting content
• Tile mode for efficient creation of textured background content
12.1.3 Modes of operation
The DCU has four modes of operation:
• DCU_OFF: When in this mode, the DCU is turned off. All the logic in the design is put in reset
state to reduce power.
• NORMAL_MODE: The DCU displays and blends the graphics specified by the layer descriptors.
• PDI_MODE: A mode which fetches video from an external video source and combines that with
the graphics configured on the layers.
• COLBAR_MODE: Color bar generation for testing purposes.
12.2 External signal description
12.2.1 Overview
The DCU has up to 22 input signals and up to 30 output signals. See Figure 12-2. The choice of signals
used depends on the configuration of the DCU. All active signals must be enabled by configuring the
appropriate PCR registers in the SIUL module.
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